1213015221 has 24 divisors (see below), whose sum is σ = 1915583904. Its totient is φ = 733558560.

The previous prime is 1213015207. The next prime is 1213015267. The reversal of 1213015221 is 1225103121.

1213015221 is a `hidden beast` number, since 12 + 130 + 1 + 522 + 1 = 666.

It is not a de Polignac number, because 1213015221 - 2⁹ = 1213014709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213015194 and 1213015203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213015291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33115 + ... + 59351.

It is an arithmetic number, because the mean of its divisors is an integer number (79815996).

Almost surely, 2^1213015221 is an apocalyptic number.

1213015221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213015221 is a deficient number, since it is larger than the sum of its proper divisors (702568683).

1213015221 is a wasteful number, since it uses less digits than its factorization.

1213015221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26721 (or 26718 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1213015221 is about 34828.3680496230. The cubic root of 1213015221 is about 1066.4866337541.

Adding to 1213015221 its reverse (1225103121), we get a palindrome (2438118342).

The spelling of 1213015221 in words is "one billion, two hundred thirteen million, fifteen thousand, two hundred twenty-one".